Archive 17/01/2023.

[Solved] Why is the HLSL and not GLSL shader chosen?

I3DB

Working through some C# sample code. At this point …

xamarin/urho-samples/blob/b72d055a424d0e6be825c0239683c225d29ee723/FeatureSamples/Core/43_BasicTechniques/BasicTechniques.cs#L104


					sphereNode.SetScale(0.2f);


					var earthModel = earthNode.CreateComponent<StaticModel>();
					//for VCol we have a special model:
					if (material.Contains("VCol"))
						earthModel.Model = ResourceCache.GetModel("Sample43/SphereVCol.mdl");
					else
						//built-in sphere model (.mdl):
						earthModel.Model = CoreAssets.Models.Sphere;


					earthModel.SetMaterial(ResourceCache.GetMaterial($"Sample43/Mat{material}.xml", sendEventOnFailure: false));
					var backgroundNode = sphereNode.CreateChild();
					backgroundNode.Scale = new Vector3(1, 1, 0.001f) * 1.1f;
					backgroundNode.Position = new Vector3(0, 0, 0.55f);
					var backgroundModel = backgroundNode.CreateComponent<StaticModel>();
					backgroundModel.Model = CoreAssets.Models.Box;
					backgroundModel.SetMaterial(Material.FromImage("Sample43/Background.png"));


					earthNode.RunActions(new RepeatForever(new RotateBy(1f, 0, 5, 0)));
				}
			}

When loading the Sample43/MatCustomShader.xml material, which uses the Smple43/TechniqueCustomShader.xml file, an error is thrown:

System.Exception: Could not find resource Shaders/HLSL/Sample43CustomShader.hlsl

This file does not exist, however the file Shaders/GLSL/Sample43CustomShader.glsl file does exist.

MatCustomShader.xml contents …

github.com

xamarin/urho-samples/blob/master/FeatureSamples/Assets/Data/Sample43/MatCustomShader.xml

<material>
	<technique name="Sample43/TechniqueCustomShader.xml" quality="0" />
</material>

TechniqueCustomShader.xml contents …

github.com

xamarin/urho-samples/blob/master/FeatureSamples/Assets/Data/Sample43/TechniqueCustomShader.xml

<!--Sample23CustomShader.glsl-->
<technique vs="Sample43CustomShader" ps="Sample43CustomShader" vsdefines="NOUV" >
    <pass name="alpha" depthwrite="false" blend="alpha" />
</technique>

And the comment at the top of that file tends to lead toward the .glsl file being the one desired, yet the engine goes for HLSL.

My own inexperience with materials and shaders leaves me with no help here.

Why does it seek out the .hlsl file and not the .glsl file?

I3DB

Ok, I think the answer is my engine is running D3D and not open GL.

GoldenThumbs

That would explain it lol. You new? Welcome if you are!